Top 10 Things you Need to Know About Investing in Bonds:

1. Bonds are fancy IOUs

Companies and governments issue bonds to fund their day-to-day operations or to finance specific projects. When you buy a bond, you are loaning your money for a certain period of time to the issuer, be it General Electric or Uncle Sam. In return, bond holders get back the loan amount plus interest payments.

2. Stocks do not always outperform bonds.

It is only in the post-World War II era that stocks so widely outpaced bonds in the total-return derby. Stock and bond returns were about even from about 1870 to 1940. And, of course, bonds were well in front in 2000, 2001 and 2002 before stocks once again took charge in 2003 and 2004. By 2008, however, the bond market had far outpaced the stock market once again, and did so again in 2011.

3. You can lose money in bonds.

Bonds are not turbo-charged CDs. Though their life span and interest payments are fixed -- thus the term "fixed-income" investments -- their returns are not.

4. Bond prices move in the opposite direction of interest rates.

When interest rates fall, bond prices rise, and vice versa. If you hold a bond to maturity, price fluctuations don't matter. You will get back the original face value of the bond, along with all the interest you expect.

5. Rising interest rates are bad for bonds.

When interest rates go up, bond prices fall. Why? Because bond buyers won't pay as much for an existing bond with a fixed interest rate of, say, 5% because they know that the fixed interest on a new bond will pay more because rates in general have gone up.

Conversely, when interest rates fall, bond prices go up in lockstep fashion. And the effect is strongest on bonds with the longest term, or time, to maturity. That is, long-term bonds get hit harder than short-term bonds when rates climb, and gain the most when rates fall.

6. A bad year for bonds looks like a day at the beach for stocks.

In 1994, intermediate-term Treasury securities fell just 1.8%, and the following year they bounced back 14.4%. By comparison, in the 1973-74 crash, the Dow Jones industrial average fell 44%. It didn't return to its old highs for more than three years or push significantly above the old highs for more than 10 years.

7. Inflation may be the biggest threat to your long-term investments.

While a stock market crash can knock the stuffing out of your stock investments, so far -- knock wood -- the market has always bounced back and eventually gone on to new heights. However, inflation, which has historically stripped 3.2% a year off the value of your money, rarely gives back what it takes away. That's why it's important to put your retirement investments where they'll earn the highest long-term returns.

8. U.S. Treasury bonds are as close to a sure thing as an investor can get.

The conventional wisdom is that the U.S. government is unlikely ever to default on its bonds - partly because the American economy has historically been fairly strong and partly because the government can always print more money to pay them off if need be. As a result, the interest rate of Treasurys is considered a risk-free rate, and the yield of every other kind of fixed-income investment is higher in proportion to how much riskier that investment is perceived to be. Of course, your return on Treasurys will suffer if interest rates rise, just like all other kinds of bonds.

9. Don't invest all your retirement money in bonds.

Inflation erodes the value of bonds' fixed interest payments. Stock returns, by contrast, stand a better chance of outpacing inflation. Despite the drubbing stocks sometimes take, young and middle-aged people should put a large chunk of their money in stocks. Even retirees should own some stocks, given that people are living longer than they used to.

10. A diversified portfolio is less risky than a portfolio that is concentrated in one or a few investments.

Diversifying -- that is, spreading your money among a number of different types of investments -- lessens your risk because even if some of your holdings go down, others may go up (or at least not go down as much). On the flip side, a diversified portfolio is unlikely to outperform the market by a big margin.

The Value of Bond Investing:

Think "bonds," and you probably think "safe," "reliable," and . . . "boring." But that is only half the story.

Bonds can provide a worry-free stream of income. But this class of securities, which crushed stocks during the three-year bear market of 2000 through 2002, also includes a wide array of instruments with varying degrees of risk and reward.

Used improperly, bonds can really mess up your financial life. Handled with care, however, bonds are among the most valuable tools in your investment kit. Here are some of the benefits they can provide:

- Diversification. Large company stocks have posted compound annual returns of nearly 10% since 1926, versus 5.7% for long-term U.S. government bonds, according to Ibbotson Associates. Yet while stocks have returned more than bonds, they are also more volatile. Combining stocks with bonds will net you a more stable portfolio. As seen during the bear market, bonds' positive returns offset the double-digit losses from stocks.

- Income. Because bonds pay interest regularly, they are a good choice for investors -- such as retirees -- who desire a steady stream of income.

- Security. Next to cash, U.S. Treasuries are the safest, most liquid investments on the planet. Short-term bonds are a good place to park an emergency fund or money you'll need relatively soon - say to buy a house or send a child to college.

- Tax savings. Certain bonds provide tax-free income. Although these bonds usually pay lower yields than comparable taxable bonds, investors in high tax brackets (generally, 28% and above) can often earn higher after-tax returns from tax-free bonds.

How Investing in Bonds Works:

Companies and governments issue bonds to fund their day-to-day operations or to finance specific projects. When you buy a bond, you are loaning your money for a certain period of time to the issuer, be it General Electric or Uncle Sam.

In exchange, the borrower promises to pay you interest every year and to return your principal at "maturity," when the loan comes due, or at "call" if the bond is of the type that can be called earlier than its maturity (more on this later). The length of time to maturity is called the "term."

A bond's face value, or price at issue, is known as its "par value." Its interest payment is known as its "coupon."

A $1,000 bond paying 7% a year has a $70 coupon (actually, the money would usually arrive in two $35 payments spaced six months apart). Expressed another way, its "coupon rate" is 7%. If you buy the bond for $1,000 and hold it to maturity, the "yield," or actual earnings on your investment, is also 7% (coupon rate divided by price = yield).

The prices of bonds fluctuate throughout the trading day as, of course, do their yields. But the coupon payments stay the same.

Say you don't buy the bond right at the offering, and instead buy from somebody else in the "secondary" market. If you buy the bond for $1,100 in the secondary market, though, the coupon will still be $70, but the yield is 6.4% because you paid a "premium" for the bond.

For a similar reason, if you buy it for $900, its yield will be 7.8% because you bought the bond at a "discount." If its current price equals its face value, the bond is said to be selling at "par."

The bottom line: There are many ways of expressing a bond's return, but "total return" is the only one that really matters. This includes all the money you earn off the bond: the annual interest and the gain or loss in market value, if any.

If you sell that $1,000 bond with the $70 coupon for $1,050 after one year, your total return is $120, or 12% -- $70 in interest and $50 in capital gains. (Prices are usually expressed based on a par value of 100, so when you sell that bond for $1,050 the price would be quoted as 105.)

Understanding Different Types of Bonds:

U.S. Treasuries are the safest bonds of all because the interest and principal payments are guaranteed by the "full faith and credit" of the U.S. government. Interest is exempt from state and local taxes, but not from federal tax. Because of their almost total lack of default risk, Treasuries carry some of the lowest yields around.

Treasuries come in several flavors:

- Treasury bills, or "T-bills," have the shortest maturities - 13 weeks, 26 weeks, and one year. You buy them at a discount to their $10,000 face value and receive the full $10,000 at maturity. The difference reflects the interest you earn.

- Treasury notes mature in two to 10 years. Interest is paid semiannually at a fixed rate. Minimum investment: $1,000 or $5,000, depending on maturity.

- Treasury bonds have the longest maturities at 10 years. As with Treasury notes, they pay interest semiannually, and are sold in denominations of $1,000.

- Zero-coupon bonds, also known as "strips" or "zeros," are Treasury-based securities that are sold by brokers at a deep discount and redeemed at full face value when they mature in six months to 30 years. Although you don't actually receive your interest until the bond matures, you must pay taxes each year on the "phantom interest" that you earn (it's based on the bond's market value, which usually rises steadily during the time you hold it). For that reason, they are best held in tax-deferred accounts. Because they pay no coupon, zeros can be highly volatile in price.

- Inflation-indexed Treasuries. These pay a real rate of interest on a principal amount that rises or falls with the consumer price index. You don't collect the inflation adjustment to your principal until the bond matures or you sell it, but you owe federal income tax on that phantom amount each year - in addition to tax on the interest you receive currently. Like zeros, inflation bonds are best held in tax-deferred accounts.

- Mortgage-backed securities represent an ownership stake in a package of mortgage loans issued or guaranteed by government agencies such as the Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corp. (Freddie Mac), and Federal National Mortgage Association (Fannie Mae). Interest is taxable and is paid monthly, along with a partial repayment of principal. Ginnie Mae has always been backed by the full faith and credit of the U.S. government. Fannie Mae and Freddie Mac, on the other hand, have been under government control since Sept. 2008, putting Uncle Sam on the hook to guarantee their mortgage-backed securities. The volatile mortgage market in late 2007 taught investors that risks for these kinds of bonds are by no means negligible. Mortgage-backed securities generally yield between 2% and 4% more than Treasuries of comparable maturities. Minimum investment: typically $25,000.

- Corporate bonds pay taxable interest. Most are issued in denominations of $1,000 and have terms of one to 20 years, though maturities can range from a few weeks to 100 years. Because their value depends on the creditworthiness of the company offering them, corporates carry higher risks and, therefore, higher yields than super-safe Treasuries. Top-quality corporates are known as "investment-grade" bonds. Corporates with lower credit quality are called "high-yield," or "junk," bonds. Junk bonds typically pay higher yields than other corporates.

- Municipal bonds, or "munis," are one of America's favorite tax shelters. They are issued by state and local governments and agencies, usually in denominations of $5,000 and up, and mature in one to 30 or 40 years. Interest is exempt from federal taxes and, if you live in the state issuing the bond, state and possibly local taxes as well. (Note that there are exceptions). The capital gain you may make if you sell a bond for more than it cost you to buy it is just as taxable as any other gain; the tax-exemption applies only to your bond's interest.

Munis generally offer lower yields than taxable bonds of similar duration and quality. Because of their tax advantages, though, their after-tax returns are often higher than equivalent taxable bonds for people in the 28% federal tax bracket or above

Bond Investing Risks:

Many people believe they can't lose money in bonds. Wrong! Although the interest payments you'll get from owning a bond are "fixed," your return is anything but.

Here are the major risks that can affect your bond's return:

Inflation risk

Since bond interest payments are fixed, their value can be eroded by inflation. The longer the term of the bond, the higher the inflation risk. On the other hand, bonds are a classic deflation hedge; deflation increases the value of the dollars that bond investors get paid.

Interest rate risk

Bond prices move in the opposite direction of interest rates. When rates rise, bond prices fall because new bonds are issued that pay higher coupons, making the older, lower-yielding bonds less attractive. Conversely, bond prices rise when interest rates fall because the higher payouts on the old bonds look more attractive relative to the lower rates offered on newer ones.

The longer the term of the bond, the greater the price fluctuation - or volatility - that results from any change in interest rates.

There is a close connection between inflation risk and interest rate risk since interest rates tend to rise along with inflation. Interest rate shifts are also a concern for mortgage-backed bondholders, but for a different reason: If interest rates fall, home owners may decide to prepay their existing mortgages and take out new ones at the lower rates.

That doesn't mean you'll lose your principal if you hold such a bond. But it does mean you get your principal back much sooner than expected, forcing you to reinvest it at the newly lower rates. For that reason, the prices of mortgage-backed securities don't get as big a boost from falling rates as other kinds of bonds.

Note that price fluctuations only matter if you intend to sell a bond before maturity, or you invest in a bond fund whose manager trades regularly. If you hold a bond to its maturity, you will be repaid the bond's full face value.

But what if interest rates fall and the issuer of your bond wants to lower its interest costs? This brings us to the next type of risk . . .

Call risk

Many corporate and muni bond issuers reserve the right to redeem, or "call," their bonds before they mature, at which point the issuer is required to pay bondholders only par value. Typically, this happens if interest rates fall and the issuer sees it can lower its costs by selling new bonds with lower yields.

If you happen to own one of the called bonds, not only do you get less than the market price of the bond, but you also have to find a place to reinvest the money. Because of the risk that you won't get the income you expect, callable bonds usually pay a higher rate of interest than comparable, noncallable bonds. So, when you buy bonds, make sure to ask not only about the time to maturity, but also about the time to a likely call.

Credit risk

This is the risk that your bond issuer will be unable to make its payments on time - or at all - and it depends on the type of bond you own and the borrower's financial health. U.S. Treasuries are considered to have virtually no credit risk, junk bonds the highest.

Bond rating agencies such as Standard & Poor's and Moody's evaluate corporations and municipalities for their credit worthiness. Bonds from the strongest issuers are rated triple-A. Junk bonds are rated Ba and lower from Moody's, or BB and lower from S&P. (You can check out a bond's rating for free by calling S&P at 212-438-2400 or Moody's at 212-553-0377, or by checking some of the bond websites we identify in "Buying bonds.")

The highest-quality municipal bonds are backed by bond insurance companies, but there is a trade-off: Insured munis typically yield up to 0.3% points less than comparable uninsured munis. Further, the insurance only guarantees your interest and principal; it won't shield you against interest rate or market risk.

Some higher-coupon munis are also "pre-refunded," meaning that, for esoteric reasons, they are effectively backed by U.S. Treasuries. When a muni is pre-refunded by an issuer, its credit quality and price rise.

Liquidity risk

In general, bonds aren't nearly as liquid as stocks because investors tend to buy and hold bonds rather than trade them. While there is always a ready market for super-safe Treasuries, the markets for other bonds, especially munis and junk bonds, can be highly illiquid. If you are forced to unload a thinly-traded bond, you will probably get a low price.